<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Internal Style Example</title>
    <style>
        body {
            background-color: lightblue;
        }
        h1 {
            color: white;
            text-align: center;
        }
    </style>
</head>
<body>
    <h1>你好，网页格式!</h1>
</body>
</html>